T-square keeper



L. BARBER. T-SQUARE KEEPER. APPLICATION FILED AUG-1B. I920.

1,404,000. Patented Jan. 17, 1922.

LEON BARBER, OF SAN FRANCISCO, CALIFORNIA.

T-SQUAIRE KEEPER.

Specification of Letters Patent. Patented Jan. 17, 1922.

Application filed August 18, 1920. Serial No. 404,329.

To all whom it may concern:

Be it known that I, LEON BARBER, a citizen of the United States,residing in the city and county of San Francisco and State ofCalifornia, have invented a new and useful Improvement in a T-SquareKeeper, of which the following is a specification.

, My invention relates to improvements in T square keepers wherein abearing is mounted at the end of a T square to retain said T square inoperative position.

The primary object of my invention is to provide an improved means formaintaining a T square in operative position on a drawing board.

Another object is to provide a device of the character described adaptedfor adjustment for use with boards of different lengths.

A further object of my invention is toprovide an improved device of thecharacter described wherein the T square holding means may be rotated toan inoperative position. 7

I accomplish these and otherobjects by means of the novel devicedisclosed in the drawings forming a part of the present specificationwherein like characters of reference are used to designate similar partsthroughout said specification and drawings and in which: 7 i V Fig. 1 isa broken planview of a drawing board and T square with my improvedholding device attached thereto.

Fig. 2 is a broken side elevation of the device disclosed in Fig. 1 on alarger scale.

Fig. 3 is a broken end view of Fig. 2.

Fig. 4 is a side elevationof the device when disengaged from the drawingboard, the yoke being advanced to the rotatable position. v v a h Fig. 5is an end view disclosing the holding means rotated to permit the Tsquare to rest flatly upon a surface.

Referring to the drawings the numeral 1 is used to designate a T squareblade provided with the usual head 2 arranged to engage the edge of adrawing board 3 in the or inary manner.. A rod 4 is secured to the endof the T square blade 1 remote from the head 2, said rod being arrangedin alignment with the longitudinal axis of the T square l and extendingbeyond the end of the T square blade. The rod 4 is provided with a.flattened end 6 arranged to be screwed or otherwise scented to the Tsquare and is oiiset as at 7 to elevate the outer end of the rod 4 for apurpose hereinafter explained.

A nut 8 provided with a shank 9 of circular section having a.rectangular lug 11 formed upon the lower side adjacent the end thereofis adjustably mounted upon the rod 4 by means of threads 12.

A. yoke 14 formed from a single stri of metal or other suitable materialShape as disclosed in the drawings is apertured at the ends 16 formounting upon the rod 4, the aperture 17 at the rearward end 16 of theyoke 14 being shaped with a rectangular lower portion and circular upperportion to fit the shank 9 and lug 11 of the nut 8. Below and betweenthe ends 16 the yoke is shaped to form a concave recess 18 arranged toreceive a spherical bearing 19 rotatably mounted therein and adapted toengage the end of the drawing board 3. A coil spring 21 is mounted aboutthe rod 4 between the forward end 16 of the yoke 14, and the nut 8',under sufficient cc'imp'ression to cause the bearing 19 to be retainedagainst the drawing board 3 with a suitable pressure' In operation myinvention is as follows: The T square 1 provided with my improved keeperis applied to the drawing board 3 in the. usual manner and the nut 8adjusted longitudinally upon the bar 4 to such a. position as will causethe rearward end 16 of the yoke 14 to engage the lug 11 of the nut shank9 when said yoke is forced back against the pressure of the spring 21 tobring the bearing 19 in enga ementfwith the drawing board 3. In t isposition suflicient pressure is applied through the bearing 19 at oneend of the board 3 to cause the T square 1 to be held in operativeposition with the head 2 in true contact with the other endof saiddrawing board. The spherical bearing 19.permits the T square l to bereadily moved laterally along the drawing board 3, and the lug 11engaging the aperture 17 of the yoke 14 prevents rota-tive movement ofthe yoke when in operative position.

When released from the operative posi: tion described, the spring 21causes the yoke 14 to be moved forward along the rod the aperture 17being advanced out of engagement with the lug 11 to the circuhrportionof the shank 9, thereby permitting the yoke 14 to be freely rotatedabout the 4; In this pos'itionthe yoke 14, normally held pendent forengagement with the drawing board 3, may be displaced to either side topermit the T square to rest flatly upon a surface and to permit the Tsquare to be- I upon a surface.

It; is readily seen from the foregoing de-' scription that I haveprovided a device of simple construction readily attached to anyT'square blade whereby operation of the T squareis greatly facilitatedwithout interfering with its use as a straight edge in other, than theoperative position. I have disclosed-the preferred form of my inventionbut, as the details of construction are 7 susceptible to wide variationI do not wish to limitmyselfto the specific construction disclosed butprefer to avail myself of such modifications as fall within the scope ofthe appended claims Having thus described my invention what I claim asnew and desire to secure by Let:

ters Patent is:

V 1. A'T square keeper comprising a bar adapted vfor attachment to theend of a T square blade; and adjustable means slidably and rotatablymounted upon said bar ar-. ranged to engage one end of a drawing boardfor. holding the T square in operative position.

v adapted. for attachment to the end of a T square-blade; a yokeslidably and rotatably mounted upon sald bar; and a bear ng rotatablymounted upon :said yoke and arrangedto engage one end of a drawing boardfor holding the T square in operative position. v 'i 3; T square keepercomprising, a bar adapted for attachment to the end of a T square'blade;a yoke slidably and rotatably Inounteduponsaid bar; and a bearingroinountcd upon said yoke and arranged} .to,.engage one end of a drawingboard for holding the T square in operative it, 2 position; andmeans forpreventing rotative moyementof saidyoke when said bearing is engagingrelation with the end of said lmWingJboard. v

Ac T square keeper comprising a bar adapted forattachment to the end ofa T sguare blade; a yoke slidably and rotatabl eased up i e a d a eari Tsquare keeper comprising a bar tatably mounted upon said yoke andarranged to engage one end of a drawing board for holding the T squarein operative position; and means for preventing rotative movement ofsaid yoke when said bearing is in engaging relation with the end of saiddrawing board; and means for retaining said bearing in engaging relationwith the end of said drawing board. 7

5. A T square keeper comprising a bar adapted for attachment to thesendof a T square blade; a yoke slidably and rotatably mounted upon saidbar; and a bearingro tatably mounted upon said yoke and arranged toengage one end of a drawing board for holding the squarein operativeposition; and means for preventing rotative movement of said yoke when.said bearing is in engaging relation withthe end of said drawing board;and means for retaining said bearing in engaging relation with. the endof said drawing board; and means vfor adjustingthe longitudinal.position of said yoke upon the bar.

V 6. A T square keeper comprising abaradapted for attachment to the en'dof a T square blade; a nut adjustably mounted upon said bar;a yokeslidably and rotatably mounted upon the bar, one end of said yoke beingarranged to engage. the nut; and, a bearing rotatably mounteduponsaid'yoke and arranged to engage one end of a draw 7 ing board forholding the'T square in op. erative position. V

7 A T square keeper-*comprising'a bar 100 adapted for attachment to theend of a' T square blade; a nut adjustably mounted upon said bar; a yokeslidably and rotatably mounted upon the bar; one end of said yoke beingarranged to engage thenut; anda 105 bearing rotatably mounted upon said,yoke and arranged to engage one end of a draw ing board for holding theT square in operative position; and means. forretaining said bearinin ena ing relation with the end 10 of said drawing board. H

8. A T square keeper comprising a bar adapted for attachment to the endof a T square blade; a nut adjustably mounted I upon said bar; a yokeslidably and rotatably 15 mounted upon the bar, one end of said yokebeing arranged to engage the nut; and a bearing rotatably mounteduponsaid yoke and arranged to engage one endof a drawing board. for holdingthe T-square in opo erativeposition; and a spring mounted upon therodvbetween' the nut and oneend of the yoke to retain the bearingthereon in engaging relationlwith the" end of said drawing board. c

9. A T square keeper comprising a bar 7 adapted for attachment to theend'of a T square blade; a nut adjustably mounted upon said bar; a shankformed upon said si a yoke slidabl and oteta ly mounted.

upon the rod, one end of said yoke being arranged to engage the rod andthe other end arranged to engage the shank of the nut thereon; a bearingrotatably mounted upon said yoke and arranged to engage one end of adrawing board for holding the T square in operative position; means forretaining said bearing in engaging relation with the end of said drawingboard; and means for preventing rotation of the yoke when the bearing isin said engaging relation with said drawing board.

10. A T square holder comprising a bar adapted for attachment to the endof a T square blade; a nut threaded upon said bar; a shank formed uponsaid nut, said shank being circular in section; a rectangular lug formedupon the lower side of said shank at the end remote from the nut; a yokeapertured at the forward end thereof to slidably and rotatably engagethe rod, and at the rearward end to slidably engage the shank and lug; abearing rotatably mounted upon said yoke and arranged to engage one endof a drawing board for holding the T square in operative position; aspring inter- V posed between the nut and the forward end of the yokefor maintaining the head of said T square and said yoke in engagingrelation with the ends of said drawing board, and

for advancing said yoke to rotative position in advance of the lug uponthe shank when the end remote from the nut; a yoke apertured at theforward end thereof to slidably and rotatably engage the rod, and at therearward end to slidably engage the shank and lug; a spherical bearingrotatably mounted upon said yoke and arranged to engage one end of adrawing board for holding the T square in operative position; a springinterposed between the nut and the forward end of the yoke formaintaining the head of said T square and said yoke in engaging relationwith the ends of said drawing board, and for advancing said yoke torotative position in advance of the lug upon the shank when said Tsquare is disengaged from the drawing board.

In witness whereof I hereunto set my signature.

LEON BARBER.

